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What is "Denier" - Definition & Explanation

A unit of measure for the linear mass density of fibers. Denier is defined as the mass in grams per 9000 meters. Loosely speaking, how "thick" a fiber is. Fibers are also measured in microns (1/1000 inch or .000039 inch)
A measure of linear density; the weight in grams of 9,000 metres of yarn.
A system of measuring the weight of a continuous filament fiber. In the United States, this measurement is used to number all manufactured fibers (both filament and staple), and silk, but excludes glass fiber. The lower the number, the finer the fiber; the higher the number, the heavier the fiber. Numerically, a denier is the equivalent to the weight in grams of 9,000 meters of continuous filament fiber.
A system of measuring the weight of a continuous filament fiber. In the United States, this measurement is used to number all manufactured fibers (both filament and staple), and silk, but excluding glass fiber. The lower the number, the finer the fiber; the higher the number, the heavier the fiber. Numerically, a denier is the equivalent to the weight in grams of 9,000 meters of continuous filament fiber.
The weight measurement of filament yarns and fibers. The low numbers represent the finer sizes and the higher numbers, the heavier yarns.

Some other terms

Some more terms:

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Manufactured, continuous filament fibers that have a center void, which has been created through the introduction of air or other gas in the polymer solution, or by melt spinning through specially...

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